Effect of Different Craft on Low Cycle Fatigue Life of Single-crystal Nickel-based Superalloy DD6 with Film-cooling Holes
The effect of electron beam machining,die sinking electro-discharge machining and small hole drilling electro-discharge machining on the low cycle fatigue performance of DD6 single crystal high-temperature alloy specimens were studied under conditions of 900℃and 540 MPa,and the micro morphology and fracture morphology of the film cooling holes were compared and analyzed.The result indicated that under the same experimental conditions,the gas film holes obtained by electron beam machining get the best fatigue life.The fatigue source is located around the gas film hole and the fracture characteristics of different drilling processes are similar,all of which are multi-source fractures.The fracture mainly includes fatigue crack source zone,propagation zone and instantaneous fracture zone.
DD6 single crystalnickel-based superalloylow cycle fatigue
万方数据
维普
